【新文速递】2025年5月27日固体力学SCI期刊最新文章

今日更新：Mechanics of Materials 2 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 6 篇Mechanics of MaterialsModel of enhanced flexural strength of ceramics at elevated temperaturesA.G. Sheinermandoi:10.1016/j.mechmat.2025.105398高温下陶瓷抗弯强度增强模型We suggest a model that describes the observed non-monotonous temperature dependences of the flexural strength of ceramics. Within the model, the flexural strength is affected by the sliding of the intergranular boundaries, which can blunt the crack tip and increase the flexural strength at certain temperatures. At the same time, at high enough temperatures, enhanced boundary sliding results in the transition from the brittle to ductile failure, which reduces the flexural strength. It is demonstrated that the fracture strength of ceramics at elevated temperatures can be strongly affected by the sliding properties of the intergranular boundaries and the loading time. The ceramics with the highest fracture strength should have low sliding resistance at short-term loading and high sliding resistance in the case of long-term loading. The results of the model quantitatively agree with experimental data.我们提出了一个模型来描述观察到的陶瓷抗弯强度的非单调温度依赖性。模型内的抗折强度受晶间边界滑动的影响，在一定温度下，这种滑动会钝化裂纹尖端，提高抗折强度。同时，在足够高的温度下，增强的边界滑动导致脆性破坏向延性破坏转变，从而降低了抗弯强度。结果表明，陶瓷在高温下的断裂强度受到晶间边界滑动特性和加载时间的强烈影响。断裂强度最高的陶瓷在短期加载时应具有较低的抗滑性，而在长期加载时应具有较高的抗滑性。模型计算结果与实验数据在定量上一致。Experimental verification of dynamic fracture performance of concrete via rate-dependent cohesive interface approach and mesoscale modelLi Sun, Xingye Wang, Chunwei Zhangdoi:10.1016/j.mechmat.2025.105397基于速率相关黏结界面法和中尺度模型的混凝土动态断裂性能试验验证This study investigates the dynamic fracture behavior of concrete under higher loading rate using a combination of notch semi-circular bending (NSCB) experiments and rate-dependent cohesive zone modeling (CZM). The experimental setup employed a split Hopkinson pressure bar (SHPB) system coupled with high-speed digital image correlation (DIC) to capture real-time crack propagation and deformation. A 2D mesoscale finite element model was developed using digital image processing (DIP) and random aggregate generation techniques to replicate the heterogeneous microstructure of concrete. Cohesive elements with velocity-dependent traction-separation laws were integrated at interfacial transition zones (ITZ) and aggregate-matrix interfaces to simulate crack initiation and growth. Results revealed that dynamic fracture toughness increased linearly with loading rates, with peak values up to 144% higher than quasi-static counterparts at 120 MPa. Notch angle significantly influenced mixed-mode fracture toughness, with a maximum KIIC of 5.165 observed at a 30° notch angle. The study demonstrated that incorporating rate effects and microstructural heterogeneity into cohesive models improves predictive accuracy, offering critical insights for designing concrete structures subjected to dynamic loading.本研究采用缺口半圆弯曲（NSCB）实验和速率相关内聚区模型（CZM）相结合的方法研究了混凝土在高加载速率下的动态断裂行为。实验装置采用分离式霍普金森压杆（SHPB）系统，结合高速数字图像相关（DIC）技术，实时捕捉裂纹扩展和变形。利用数字图像处理（DIP）和随机骨料生成技术建立了二维中尺度有限元模型，以复 制混凝土的非均匀微观结构。在界面过渡区（ITZ）和聚集体-基体界面处集成具有速度依赖牵引-分离规律的内聚元素，模拟裂纹的萌生和扩展。结果表明，动态断裂韧性随加载速率线性增加，在120 MPa时的峰值比准静态断裂韧性高144%。缺口角度对混合模式断裂韧性影响显著，30°缺口角度下KIIC最大，为5.165。该研究表明，将速率效应和微观结构非均质性纳入内聚模型可提高预测精度，为设计受动荷载影响的混凝土结构提供重要见解。International Journal of PlasticityLüders band-assisted high uniform ductility in ultrastrong ferrous medium-entropy alloy via hierarchical microstructureHyeonseok Kwon, Jae Heung Lee, Alireza Zargaran, Stefanus Harjo, Wu Gong, Jaemin Wang, Gang Hee Gu, Byeong-Joo Lee, Jae Wung Bae, Hyoung Seop Kimdoi:10.1016/j.ijplas.2025.104378 基于分层显微组织的<s:1> ders波段辅助的超强亚铁中熵合金的高均匀塑性In this work, we harness a hierarchical microstructure to tailor both the strengthening and deformation mechanisms of Co21Cr12.5Fe55Ni4Mo7.5 (at%) ferrous medium-entropy alloy (MEA) simultaneously. A simple thermomechanical processing (cold rolling and 90 s of annealing) creates a hierarchical microstructure composed of ultrafine recrystallized grains, non-recrystallized grains with rolling-driven substructures, and intragranular nanoprecipitates. The hierarchical microstructure with the high density of dislocations and ultrafine recrystallized grains leads to a high yield strength of ∼1.60 GPa, but it is well-known that the same features can make materials vulnerable to premature fracture. To solve this issue, Lüders deformation, which was induced by the ultrafine grain boundaries and stress-induced martensitic transformation facilitated by pre-existing martensite nucleation sites, was harnessed: stable propagation of the Lüders band delays massive strain hardening by regulating strain-induced martensitic deformation that ensues and enables a large uniform ductility. Resultantly, tensile strength of ∼1.84 GPa and uniform elongation of ∼20% are achieved, on par with the finest tensile properties among multi-principal element alloys ever reported. Our results point to a paradigm to achieve a large uniform ductility via harnessing the Lüders deformation without compromising strength, based on the hierarchical microstructure.在这项工作中，我们利用分层显微结构同时定制Co21Cr12.5Fe55Ni4Mo7.5 （at%）亚铁中熵合金（MEA）的强化和变形机制。简单的热机械处理（冷轧和90秒的退火）产生了由超细再结晶晶粒、具有轧制驱动亚结构的非再结晶晶粒和颗粒内纳米沉淀组成的分层微观结构。具有高密度位错和超细再结晶晶粒的分层微观结构导致了高达1.60 GPa的屈服强度，但众所周知，同样的特征也会使材料容易过早断裂。为了解决这一问题，利用了由超细晶界和马氏体成核区促进的应力诱导马氏体转变引起的l<s:1> ders变形：l<s:1> ders带的稳定扩展通过调节应变诱导马氏体变形来延迟大量应变硬化，从而实现了大的均匀延展性。结果，达到了1.84 GPa的抗拉强度和20%的均匀伸长率，与迄今为止报道的多主元素合金中最好的抗拉性能相当。我们的研究结果指出了一种范例，通过利用<s:2> ders变形而不影响强度，实现基于分层微观结构的大均匀延展性。Thin-Walled StructuresStiffness modulation-driven deployable and rollable display systemKexi Zhu, Youcai Chen, Changming Yang, Ming Lidoi:10.1016/j.tws.2025.113511 刚度调制驱动的可展开和可滚动显示系统The next-generation deployable and rollable display system with multi-scenario applications undergoes both in-plane deploying and out-of-plane rolling, leading to requirement conflict on membrane stiffness. In this manuscript, we propose a stiffness modulation strategy to guarantee both stringent flatness for deploying and low bending strains for rolling through discrete stiffeners. Based on the plate/beam theory and von Kármán equations, theoretical models are established to efficiently evaluate the deploying and rolling capabilities of the stiffened membrane. The non-gradient Multi-Island Genetic Algorithm (MIGA) is implemented to obtain the optimal design of stiffeners, and the related stringent flatness and flexibility of the display system are verified through the deploying and rolling experiments. The stiffness modulation strategy and theoretical models provide a useful guidance for the development of the next-generation deployable and rollable display system.具有多场景应用的下一代可展开和可滚动显示系统经历了面内展开和面外滚动，导致膜刚度需求冲突。在本文中，我们提出了一种刚度调制策略，以保证部署的严格平整度和通过离散加强板轧制的低弯曲应变。基于板梁理论和von Kármán方程，建立了有效评价加筋膜展开和轧制性能的理论模型。采用非梯度多岛遗传算法（MIGA）对加强筋进行优化设计，并通过展开和滚动实验验证了显示系统的严格平整度和柔性。所提出的刚度调制策略和理论模型为下一代可展可卷显示系统的开发提供了有益的指导。Strengthening of hot-rolled S355 steel I-section beams using WAAM high strength steelJiachi Yang, M. Ahmer Wadee, Leroy Gardnerdoi:10.1016/j.tws.2025.113437 采用WAAM高强度钢对S355型钢热轧工字钢进行加固An experimental investigation to assess the major-axis flexural behaviour of 12 hot-rolled S355 steel I-section beams strengthened by the addition of high strength steel (HSS) through wire arc additive manufacturing (WAAM) is presented. The geometry of the beam specimens was obtained by means of 3D laser scanning. The mechanical properties of both the hot-rolled and the WAAM steel were determined through monotonic tensile testing. Physical testing of the strengthened beam specimens was conducted. The results showed that the WAAM strengthening led to dramatic increases in bending resistances of between 35% and 80% under four-point bending, and of between 30% and 85% under three-point bending, for increases in mass of between just 5% and 15% respectively. At the same time, the specimens exhibited good ductility, despite the high strength of the WAAM additions. The presented experimental results, which are the first of their kind, successfully demonstrate the applicability of the proposed strengthening approach for both new and retrofitted steel beams, and the game-changing potential for enhancements in structural efficiency and reductions in embodied carbon in the construction industry.通过电弧增材制造（WAAM）对12根添加高强度钢（HSS）的S355型钢热轧工字截面梁进行了主轴弯曲性能的试验研究。采用三维激光扫描的方法获得了光束试样的几何形状。通过单调拉伸试验确定了热轧钢和WAAM钢的力学性能。对加固梁试件进行了物理试验。结果表明，在四点弯曲条件下，WAAM的强度增加了35%至80%，三点弯曲条件下，强度增加了30%至85%，而质量增加仅为5%至15%。同时，尽管添加了高强度的WAAM，试件仍表现出良好的延性。所提出的实验结果是同类实验中的第一个，成功地证明了所提出的加固方法对新钢梁和改造钢梁的适用性，以及在建筑行业中提高结构效率和减少隐含碳的改变游戏规则的潜力。Sound radiation of shells of revolution with free-form meridian based on data-driven enhanced algorithmQingyang Huang, Lin Wang, Huai Cao, Yuan Lu, Jie Gao, Yicang Huang, Xiaoqiang Zhoudoi:10.1016/j.tws.2025.113507基于数据驱动增强算法的自由子午线旋转壳体声辐射The fitted-element radiation superposition (f-ERS) method is proposed to analyze the acoustic radiation characteristics of doubly-curved shells of revolution with free-form meridian, based on the data-driven enhanced-generalized differential quadrature method (DE-GDQ). According to the first-order shear deformation theory (FSDT) and DE-GDQ, the free vibration characteristics of doubly-curved shells can be obtained. The point force excitation is introduced according to force discontinuity. A fast and accurate far-field acoustic radiation characteristics results are obtained based on f-ERS. After analyzing and verifying the convergence of DE-GDQ and f-ERS, as well as the applicability of the acoustic field, an in-depth discussion was conducted on the sound radiation characteristics of the structure under different models, types of excitation, positions of observation points and carbon fiber reinforced polymers (CFRP) material mechanical parameters. The study improves the computational efficiency of acoustic radiation and discusses the coupling effects between the shell’s curvature, CFRP parameters and acoustic radiation in detail. It provides a theoretical basis for the design optimization of shells.基于数据驱动的增强广义微分正交法（DE-GDQ），提出了具有自由子午线的双曲旋转壳体声辐射特性的拟合元辐射叠加法（f-ERS）。根据一阶剪切变形理论（FSDT）和DE-GDQ，可以得到双弯曲壳的自由振动特性。根据力的不连续特性引入点力激励。基于f-ERS获得了快速准确的远场声辐射特性结果。在对DE-GDQ和f-ERS的收敛性及声场适用性进行分析验证后，深入探讨了不同模型、激励类型、观测点位置和碳纤维增强聚合物（CFRP）材料力学参数下结构声辐射特性。该研究提高了声辐射的计算效率，并详细讨论了壳体曲率、CFRP参数与声辐射之间的耦合效应。为壳体的优化设计提供了理论依据。SGM-PEM stochastic vibration study of FG-GPLRC cylindrical shell with distributed DVAsHaochen Hu, Rui Zhong, Qingshan Wangdoi:10.1016/j.tws.2025.113508FG-GPLRC圆柱壳分布dva的SGM-PEM随机振动研究A dynamic model of a functionally graded graphene platelet-reinforced composites (FG-GPLRC) cylindrical shell with distributed dynamic vibration absorbers (DVAs) has been established. The material properties are derived using the Halpin-Tsai micromechanics model. By simplifying the DVA as a combination of mass blocks and linear springs, the model is further reduced. Using the First-Order Shear Deformation Theory (FSDT) and the pseudo-excitation method (PEM), the Lagrangian energy functional of the structure is constructed. The displacement functions of the structure are constructed using the spectro-geometric method (SGM), and the energy functional is subjected to Rayleigh-Ritz variational computation. The accuracy of the method is validated through comparative numerical examples. Based on this, the effects of material parameters, structural dimensions, boundary conditions, and DVA-related parameters on the vibration characteristics of the structure are explored.建立了具有分布动态吸振器（DVAs）的功能梯度石墨烯片状增强复合材料（FG-GPLRC）圆柱壳的动力学模型。利用Halpin-Tsai微观力学模型推导了材料的性能。通过将DVA简化为质量块和线性弹簧的组合，进一步简化了模型。利用一阶剪切变形理论（FSDT）和伪激励法（PEM），构造了结构的拉格朗日能量泛函。采用光谱几何方法（SGM）构造了结构的位移函数，能量泛函采用瑞利-里兹变分计算。通过数值算例对比验证了该方法的准确性。在此基础上，探讨了材料参数、结构尺寸、边界条件和dva相关参数对结构振动特性的影响。GBT-Based Buckling Analysis of Cold-Formed Steel Built-Up Section ColumnsCilmar Basaglia, Dinar Camotim, Rodrigo Gonçalvesdoi:10.1016/j.tws.2025.113509基于gbp的冷弯型钢组合截面柱屈曲分析This work reports the results of an investigation on the use of Generalised Beam Theory (GBT) to assess the buckling behaviour of cold-formed steel built-up members connected by discrete fasteners. After providing an overview of the main concepts and procedures involved in performing GBT buckling analyses, the paper presents the formulation, implementation and illustrative application of a GBT-based beam finite element accounting for the presence of discrete fasteners by means of either (i) constraint equations, an approach that constitutes a first step towards more realistic fastener simulations, which involves a simplified and easy-to-apply formulation, or (ii) three-dimensional (3D) connection elements with adjustable stiffness and developed using Timoshenko beam theory - particular attention is devoted to the determination of the linear and geometric stiffness matrices. In order to illustrate the application and evidence the potential and advantages of the proposed approaches, namely concerning their ability to provide in-depth information about the mechanics of instability in built-up members, several illustrative examples are presented and discussed in detail - they deal with columns built-up from two or three lipped channel profiles. For validation purposes, most of the GBT-based results obtained are compared with values yielded by accurate (“exact”) Ansys shell finite element analyses - a virtually perfect match is invariably found. The proposed GBT-based formulations make it possible to perform comprehensive parametric studies on cold-formed built-up columns, namely those aimed at investigating the optimal fastener placement or exploring different combinations of the component profiles forming the built-up columns.这项工作报告了使用广义梁理论（GBT）来评估由离散紧固件连接的冷弯钢组合构件的屈曲行为的调查结果。在概述了执行GBT屈曲分析所涉及的主要概念和程序之后，本文介绍了基于GBT的梁有限元的公式、实现和说明应用，该方法通过(i)约束方程来考虑离散紧固件的存在，这种方法构成了更现实的紧固件模拟的第一步，它涉及简化和易于应用的公式；或(2)三维(3 d)连接元素与发达使用得票率最高可调刚度和梁理论——特别关注致力于线性的决心和几何刚度矩阵。为了说明应用和证据的潜力和所提出的方法的优势，即关于他们的能力提供深入的信息，不稳定的结构构件，几个说明性的例子被提出和详细讨论-他们处理柱由两个或三个嘴状通道轮廓。为了验证目的，大多数基于gbp的结果与精确（“准确”）Ansys壳体有限元分析产生的值进行比较-几乎完美匹配总是被发现。提出的基于gbt的配方使得对冷成型的组合柱进行全面的参数研究成为可能，即那些旨在调查最佳紧固件放置或探索形成组合柱的组件轮廓的不同组合。Experimental study on compressive behavior of S690 and S960 high strength steel transverse plate-to-CHS X-joints considering welding heat input effectsXian-Wei Xu, Xiaoyi Landoi:10.1016/j.tws.2025.113510考虑焊接热输入效应的S690和S960高强度钢横向板- chs x型接头抗压性能试验研究This paper presents an experimental investigation on the compressive behavior of high strength steel (HSS) transverse plate-to-circular hollow section (CHS) X-joints. Seven grade S690 and seven grade S960 steel test specimens under axial compression in the gusset plates were tested to evaluate effects of the steel grade, the welding heat input and the geometric parameters. Three distinct heat inputs of 0.95, 1.24 and 1.44 kJ/mm were used for the robotic welding of the gusset plates to the CHS chord. The gusset plate width to the chord outer diameter ratio (β) ranged from 0.50 to 0.98, and the chord outer diameter to wall thickness ratio (2γ) varied from 28.5 to 42.0. The deformation capacity and static strengths of test specimens were assessed, and suitability of the normal strength steel design rules of EN 1993-1-8, prEN 1993-1-8 and ISO 14346 for the HSS joints was evaluated because of the absence of the relevant design provisions. It is found that all test specimens failed by chord plastification and the joint deformation capacity can be considered as adequate. The joint strength nonlinearly increased with increasing β ratio and decreasing welding heat input, but decreased for large 2γ ratio. Considerable joint strength improvements were observed for higher steel grade, demonstrating that HSS material strengths can be reasonably utilized. The current codified design rules were generally inaccurate for S690 steel plate-to-CHS X-joints and unconservative for S960 steel counterparts.本文对高强度钢（HSS）横向板-圆空心截面（CHS） x形节点的抗压性能进行了试验研究。对7个S690级和S960级钢试件进行了轴向压缩试验，评价了钢种、焊接热输入和几何参数对扣板轴向压缩的影响。采用0.95、1.24和1.44 kJ/mm三种不同的热输入，实现了折板与CHS弦的机器人焊接。扣板宽度与弦外径之比（β）为0.50 ~ 0.98，弦外径与壁厚之比（2γ）为28.5 ~ 42.0。对试件的变形能力和静强度进行了评估，并对EN 1993-1-8、prEN 1993-1-8和ISO 14346标准强度钢设计规则对高速钢接头的适用性进行了评估，因为没有相关设计规定。结果表明，所有试件均因弦塑化而失效，节点的变形能力可以认为是足够的。随着β比的增大和焊接热输入的减小，接头强度呈非线性增大，但随着2γ比的增大而减小。随着钢级的提高，接头强度有了明显的提高，这表明HSS材料的强度可以得到合理利用。目前的设计规则对于S690钢板- chs x型接头来说通常是不准确的，对于S960钢板- chs x型接头来说是不保守的。来源：复合材料力学仿真Composites FEM